| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| roberts_ecofarm | "Clarifying - 1. Ideally Id like to upload daily. For some sites I will be able to connect to the web either through wifi or through cell service. ..." | Read more » | over 5 years ago | |||
| MadTinker | "A couple of clarifying questions: do you have a time period in mind for sampling before data collection/processing? do you have any form limitati..." | Read more » | over 5 years ago | |||
| stevie | "Oh great project! Pinging in a couple people who might be interested: @cfastie @pdhixenbaugh @donblair @rebeccah @bhickman @JSummers Anyone have i..." | Read more » | over 5 years ago | |||
| warren | "Welcome! Very cool! " | Read more » | over 5 years ago | |||
| jpkearns | "Our systems are simpler, lower in cost, and made from common local materials. Please get in touch if you have questions - www.aqsolutions.org " | Read more » | over 8 years ago | |||
| eustatic | "very cool. good question regaring the water pressure control, I've often wondered that myself. " | Read more » | over 8 years ago | |||
| liz | "FYI Public Lab, additional informal conversation on this is also happening on the WeChat app -- let us know if you want to join there " | Read more » | over 8 years ago | |||
| QMTphysicist | "Hi Suiris, it good to see how filtering the tap water works. How do you take transmittance measurements using spectralworkbench? I am looking into ..." | Read more » | over 8 years ago | |||
| Suiris | "The test was just to measure the difference in clarity between tap water and filtered water, using a single wavelength instead of a white warm LED ..." | Read more » | over 10 years ago | |||
| Ernie | "I afraid that using a laser will not tell you much about the chemical composition of any contamints in your water. The laser spectrum is much too ..." | Read more » | over 10 years ago | |||
| Suiris | "Hi drabanus, The time span between each spectra was less than 30 seconds and the LED light had been on for quiet some time before I began the tests..." | Read more » | over 10 years ago | |||
| Suiris | "Hi Ernie, Thanks for the great advice and information. To be honest I am completely new to te spectrometer hobby and most of what you wrote baffles..." | Read more » | over 10 years ago | |||
| drabanus | "One other test to characterize the stability of your spectrometer is to just repeat identical measurements after a certain time span, say minutes, ..." | Read more » | over 10 years ago | |||
| Ernie | "Some typo's in my previous post: To normalize your sample spectrum, you will want (delete "you") to divide... Use an (delete "sample") empty bottle..." | Read more » | over 10 years ago | |||
| Ernie | "I hope your system is mechanically stable so as to get reproducible spectra. With regard to the illumination spectrum (the LED), it is not truly w..." | Read more » | over 10 years ago | |||
| Suiris | "I am using a Canon IXUS 120 IS for taking pictures, then I cut out the spectrum from the black background, paste it as a new image and upload it t..." | Read more » | over 10 years ago | |||
| danbeavers | "OK then I would like to know about your work flow. Are you using a camera attached to your computer or are you taking a picture and then processing..." | Read more » | over 10 years ago | |||
| Suiris | "I noticed the shift too danbeavers. My thoughts are that when I cut out the spectrum from my image and pasted it as a new image I wasn´t carefull w..." | Read more » | over 10 years ago | |||
| danbeavers | "I wonder about the peaks appearing to shift between different exposures. Looking at the left most peak the filtered 8 second exposure is to the ri..." | Read more » | over 10 years ago | |||
| Suiris | "Boiling the samples down to half their volume is a great idea! Will try that next time and see if there are any volatile contaminants. " | Read more » | over 10 years ago | |||
| Suiris | "Hi cfastie. Thanks! The water I tested came from the faucet in Stockholm, Sweden. The water treating plants here have a hard time filtrating medici..." | Read more » | over 10 years ago | |||
| cfastie | "Excellent test. What do you think is in your water? Particulate matter? Or something dissolved, like a salt? Either way, if you boiled some down to..." | Read more » | over 10 years ago |